Tripping mechanism for printing-presses



F. H. BERO LD. TRIPPING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED OCT. 30, I9I6.

1,357,945. Patented Nov. 9, 1920.

4 SHEETS-*SHEET I.

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F. H. BEROLD.

TRIPPING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED OCT. 30, I916.

1 ,357,945, I Patented Nov. 9, 1920.

4 SHEETS-SHEET Z.

ll/z'fzzess a Q, jzuenfozw Jim ' Jwwkyk;

F. H. BEROLD.

TRIPPING MECHANISM FOR PRINTING PHESSES. APPLICATION FILED OCT. 30. 1916.

1,357,945, Patented Nov. 9, 1920.

J 4 SHEETS-SHEET 3. 2 1

F. H. BEROLD.

TRIPPING MECHANISM FOR PRINTING PRESSES..

APPLICATION FILED OCT. 30. I916.

1535?,945, Patented Nov. 9, 1920.

4 SHEETS-SHEET 4- ,g/ifii 0183 8 "1 M m'faesses:

ail/i440.

UITED T FREDEEIU;

1f. BEROLD, GE WYOI /IING, OHIO.

TRIPPING MECEANISIVI FOR PRINTING-PEEESES.

Specification. of Letters Patent.

Patented Nov. 9, 1920.

Application filed october 30, 1916. Serial No. 128,506.

To all '20 ham it on ay concern:

Be it known that I, Fnnnnnicn H. Bnnoiin, a citizen of the United States, residing at v l yoniing, in the county oi Hamilton and State of Ohio, have invented certain new and useful Improvements in Tripping Mechanism for Printing-Presses of which tl e following is a specification. My invention relates to mechanism for tripping the inipression-cylinder in print ing presses and is applicable in s-o-called fiat-lied presses as Well as in presses einployinp; a rotary type or plate cylinder or cylinders. l have exemplified niy invention as applied to a rotary printing press;

it the Oliiifiili of my invt-u'riion to provide a printing press comprising an pi'ession-cylinder which is normally in cit? impression relation to the prin ing surface, and is arranged to be held in t 1i iiiipi'es&;;i i1 relation to the printing surface and mechanism whereby the impress-doil-cylinder is caused to approach the path of the printi' surface at each revolution of the impressioncylinder Whether the impression-cylinder he rotating in oil-impression or in oniinpression relation to the printing surface;

iurther to provide manually controlled men 9; whereby the impression-cylinder is maintained in printing;- position and where by, further, the impression-cylin or is re leased. from printing or cn-inzpre son pos.'- tion intonormol off-impression, osfon.

T; is the object of my invention further to provide gripper-moch risin and to so relate the iinpression-cylinoer tripping means as to insure the proper grippins; of the sheet iorproper reois'try thereo' at each revolution ot the impresiioirevlinder, so that the sh et is received properly about the impression-cylinrlen Whe her the impresw sioncvlinder at the revolution thereot it which the sheet is taken is in printing or in Oiii-lTHDIESSlOIl relation; in order, among other things that the sheet may be properly printed and may be properly delivered into the sheet-delivery i'flOClltiHii'IIl regardless of whefher the sheet has con printed or not.

it is the object of my invention further,

to provide novel means for tripping on impression-cylinder making one revolution to an impression, throughout at least half the circumference of the impressioircylinder and also causing positioning of the impression-cylinder in exact sheet-taking position at each revolve tion thereof for taking the sheet, Whether the inipression-cylinder be tripped or 1111- tripped.

It is the object of my invention further, to provide novel'meens exemplified as an eccentric mounting for the impression-cylinder and a quick-acting cani control for the ec centric, comprising a part for causing movement of the impression-cylinder into sheetreceiving position at each sheet-gripping movement of the grippers thereon, whereby the gripper means on the impression-eylin der are brought into registering relation with the stopgage the sheets being printed at each revolution of the impres- SlOli-Cfy'illldl, and quick recession of the inipression-cylinder is caused, upon tripping of the impressioncylinder, immediately after the proper gripping of the sheet by the n'rippers, so as to quickly withdrew the tympan portion of the impression cyl nder from the printing surface, whereby a maxi mum amount of tympsn-suriece about the impression cylinder is capable of being provided and employed in pr nting. and, further, to provide novel means whereby the iinpression-cylinder is moved into sheet-receiving position each sheet-gripp ng movement of" the grippers thereon Whether the control for the sion-cvlinder relation.

It is the obiect of my invention further, to provide a tripping mechanism comprising a pair of latched members, one of which Es ar anged o be automatically placed in unlocking position, and the other of which: is under control o the operator; fu ther. to correlate the moment of automatically placing; one of the latched iiiernhers in un ocking position w th the moment o't sheet-takion by the m'ipperine h nism; and, turtheir to provide rneans under the control of the operator for maintaining the manually is in tripped or in untripped enabling the printing position of the imprescontrolled latch-member in unlatching relais a front'side elevation of so much of a printing "press as is necessary to illustrate my invention.

Fig. 2 is a rear side elevation of the same. Fig. 3 is a section of the same, taken in the plane oi the line of Fig.4.

Fig. l is a plan view oi the same, partly 7 broken away.

Fig. 5 is a section, taken on the line 55 of Fig. 4, showing the operating means for the meet-grippers and the stop gage for the sheets. V

' Fig. 6 is an axial section of a detail of the mounting for one end of the impressioncylinder, taken the plane of the line 6--6 of Fig. 7; and

Fig. 7 is a cross-section of the same, taken in the plane of the line 77 of Fig. 6.

Fig. 8 is a side-eievation showing a detail oi'the latching means for the impression-cylinder, ith the latching parts in position for coact-ing relation.

11 represents the main frame of the machine, inwhich an impression-cylinder i2 is rotatably mounted. The impressionc'ylinder cooperates with suitable type or printing plates, which may he either mounted flatwise, for instance on a reciprocating carriage, or on a rotatable cylinder or cylinders. I- have exemplified a plurality of plate-cylinders 13, of which one or more may be employed having suitable printing plates indicated at 16 in 5, suitably secured thereto. The'platecylinders are suitably journaled in the main frame, as in bearings 1%. Suitable inking mechanism is provided tor cach oi' the plate-cylinders, as instanced by the rollers 15;

T he impression-cylinder is provided with gudgeons 17, no; ipliiied as eccentrically journaled in bushings 18 the respective 7 ends of the cylinder, rockahle in hearings 19 in the main frame.

T e impression-cylinder is exemplified as comprising an impressioirpart 21, and a sunken part 22, at the periphery of the cylinder, (see Fig. 5), the sheet to be printed being *anged to be received across the impressioncr tympa-n part of the cylinder, and the sunken part being provided to pass the plate-cylin without contacting with the printing sin-races. The impression-part is exemplified as extending t ice of the impression-cylinder.

e provided cans whereby the imroughout the greater part of the circume *lGTrCQllllfih-Il is normally in imprinting or ,oii-impresswn relation. 1 have also prothe latter devices comprise a latch which is automatically placed in unlatching relation proximate to the moment of the location of the llIllJTGS-Si.0110:,llilll in sheet-taking position.

This moment of automatic release of the latch e the moment at sheet-taxing relation oi the grippers, are proximate or substantially coincident, so th t proper oi": the sheetis assured and the sheet cause-"l to travel past the platecylinder or cylinders, throughout its path of travel, eitherin on-impression or in oil-impression relation, so that it the impressioncylinder is in oil?- impression relation, contact of the sheet with any part of the pr r suriace ,1 avoidechand furthe n i that when the sheet is to cl it inpression position it shall term 7 elation throughout its entire path past. the printing surfaces.

T n ,rl-xer-ipl ture for accompllshing t x the bushings have arms A roclcshart 26 is journaled in bearings in the main frame and has arms 27 fixed th reon. Links 28 connect the 2e and 27, at-tho respective sides oi the mac 'ne,.with which they are i j articulated by articulations 29 The links are ensible by means e threaded connec 31 therein.

An arm 32 is rigid with the rock-shaft 26, and coacts with a cam 33 rotatingin unison with the impression-cylinder. The arm carries anti-friction roller 34:, which is arranged to bear on the cam when the parts are in coactive relation. The cam 33 has an axis oi rotation instancedas coincident with the axis of a stud-shaft 163, journaled in a bearing in the main frame. A gear 36 is fixed on a shaft 85. A drive-pinion 37 meshes with the gear 86 and with a gear 38 on a shaft 39 journaled in a hearing in the main frame. A gear 4:0 is also fixed to said shaft and meshes a gear ll which rotates the impression-cylinder. The plate-cylinders are provided with e2 meshing with the gear tl "for rotating the plate cyl- The cam 33 comprises a low portion 51, a high portion 52, and preferably an apex resting portion 53. The low portion extends throughout the greater portion of the cam, the high portion having comparatively abrupt climbing and receding faces 54:, 55, for causing comparatively abrupt approach and recession of the impression-cylinder with relation to the plate-cylinders, for the purpose hereinafter explained. v a

The roller 34 is normally urged into contact with the cam so as to normally coact with the low portion 51 of the cam, accomplished by means of a spring 56 shown encircling a rod 57, slidable in a bearing 58 pivoted. in a lug 59 of the frame. The rod is articulated at 61 with an arm 62 fast on the rock-shaft 26. The tension of the spring is adjusted by means of a nut 63, locked in place by a jam-nut 64: received about the threaded end 65 of therod.

The spring'normally urges oif-impression relation of the impression-cylinder, but at each revolution of the cam the impressioncylinder is moved for causing its grippers 68 to move into definite relation with positioning means for determining the sheet position, exemplified as stop-gages 6 9, so as to insure a definite relation between the grippers and stop-gages for insuring proper tal' i'ng and gripping of each sheet fed against the stop-gages, so as to insure proper print ing of the sheet if the impression-cylinder is in on-impression relation; and proper delivery of the sheet to suitable delivery mech anism whether the impression-cylinder isin on-impression or off-impression relation. Such delivery mechanism is exemplified as a transfer-roll 71, provided with delivering grippers 72 which take the sheet upon release thereof by the cylinder-grippers and feed the same away from the impressioncylinder mediately or immediately to sheetdelivering position. The latter mechanism may be of usual construction and is not therefore more particularly shown.

If it is desired to maintain the impression-cylinder in printing or on-impression relation, the roller 34: is maintained out of contact with the low portion of the cam, accomplished in the present instance by a latch, comprising a latch-member 81, c0ntrolled automatically by the mechanism of the machine, and a latch-member 82 which is manually controlled. The latch is provided with retaining means, comprising a tongue 83 on one of said members received in a groove 84 on the other of said members, for retaining the members in coacting relation.

At each rotation of the cam, the apexportion 53 of the cam contacts the roller 34, whether the impression-cylinder is in printing relation or in off-impression relation, in

i order to automatically move the latch-memher 81 sufiiciently to permit release of the manually controlled latch-member 82, when the latter is being urged toward releasing position, as hereinafter described The release of the retaining members, of the latch takes place proximateto the moment of .coaction between the impressioncylinder grippers and the stop-gages, and preferably just subsequent to the gripping of the sheets-by the grippers. Therejis pref? erably a slight dwell or concentric face on the cam at its apex-portion so as to maintain the impression-cylinder momentarily in extreme approach toward the plate-cylinders for permitting completion of action of the sheet-taking grippers and release of the latch, at a moment slightly prior to arrival of the advance edge of the sheet opposite the printing surface on the first plate cylinder. This extreme approach of the impression-cylinder toward the plate-support, that is, toward the stop-gage 69, is caused by the rocking of the eccentric bearings 18 by the apeX-portion 53 of the cam, placing said eccentric bearings in the present instance in radial positions, differing from the radial positions of the same when the impression-cylinder is in either the on-impression relation or the off-impression relation hereinbefore mentioned, and causing rotation of said impression-cylinder in a rotary path which differs fromrthe rotary paths of the same when said impressioncylinder is in either of said on-impression or off-impression relations. If the impression-cylinder is to be moved into off-impression relation the abrupt receding face 55 of the cam permits the recession to be accomplished quickly, but without jar.

The latclrmember 82 is fast on a rockshaft 86 journaled in bearings in the main frame. The shaft also carries a double arm 88, 89,'fi -:ed thereon, springs 91, 92, coach ing withthe respective arms. The spring 91 is received about a rod 93 articulated at 94 to the arm 88 and arranged to bear against the bearing 95 pivoted in the frame through which the rod passes, and a collar 96 adjustably fixed to the rod by a setscrew 97.

A rod 101 slides in a bearing 102 on the arm 89, and is articulated at 103 with a roclrer ba,r 10st. The spring 92 encircles the rod and is received one end against the bearing 102and its other end against a collar 106 adjustablyiixed to the rod by a set-screw 107. A stop 108, limits the retraction of the rocker-bar 10st.

The rocker-bar rocks on a stud-shaft 111 journaled in a bearing of the frame. It is provided with a dog 113 arranged to be engaged by a keeper 114 011 a lever 115,

pivoted on a stud 116 in a bearing of the main frame. The lever is provided with 7 15 11 119, 20- A spring 121 acts on the arm 119 or normally urging the keeper into the path of the dog 113. The spring is received about a rod 122 articulated at 123 to the arm 119 and slidable ina hearing 12 i pivoted to the frame; the spring being located between said bearing and a collar 125 adjustabiy fined to the rod by a set-screw 126. H

A; pedal 180 is on arod 131 received through a bearing in theplatt'orm133, and is articulated at 13% to the arm 120 of the lever 115.

A pedal 136 is on a rod 1 through a bearing 138 in the pi t'form and articulated at 139'With the rocker-bar 1%.

'lVhen the pedal 130 -is-depressed, t e keeper 114 is brought out of range oi the dog 113 Which, by the action of the spring 92, moved out 01"; range of the keeper, the spring causing movement of the rockerbar, the stop 108 limiting saidmovement. When the loot is taken oil thetre'adie 180 the keeper returns to normal position, ready to engage the dog When the latter is brought Within its range.

The release of the dog for oil-impression relation of the impression-cylinder causes received extension of the spring 92 and brings the double arm structure 88, 89, under the moving influence or the spring 91, ior causing torsionalstrain in the shaft 86 and applythe same into range with the latch-member 81. ri stop 90 limits the movement of the latch-member 82 in such coactive relation. The movement of the latch-member 82 in the opposite direction, that is to say, into oft-impression relation, is restrained by the retaining members 83, 84:, until the roller is contacted by the apex-portion 53'of the cam This contact causes automatic movement of the latch-member 81 away from the latch-member 82, sutiicient to release the retaining connection 83, 84, between the same, thereby permitting the force being applied by the spring 91 to be effective in moving the latch-member 82. thereby permitting the roller 3 to follow the receding portion 55 of the cam to the low portion 51 thereof, for placing the iming orce upon the latch-member S2 to. urge pression-cylinder in unprinting or citizenpressicn relation.

This movement can, however, talre place only just prior to the arrival of the beginning of the printing or tympan portion of the cylinder opposite the printing surface of the first plate-cylinder, and subsequent to the moment of gripping action of the grippers on the impression-cylinder upon the sheet. The parts are so related preferably that when the parts are-positioned for elf-impression relation of the impression-cylinder the movement of the roller 34: along the receding face 55 of the high'portion of the cam will have been of sufficient extent, prior to the arrival ofthe initialend of the tympan portion of the impression-cylinder at printing relation with the first plate-cylinder, so that the impres sion cylinder will have moved away from the first plate-cylinder sufiiciently to avoid contact of the sheet with the inked printing surface on first plate-cylinder. I I The grippers 68 are adjustably fixed in the usual manner to a gripper-shaft 145, journaled in suitable bear'ngs in theimpression-cylinder. The gripper shaft has a rocker-bar 1&7 fixed thereon, provided with slots 148, 'l he frame is provided with pin 151 which coacts with the slot 1&9 for moving the grippers into gripping position, with pin 150 which coacts with the slot 1&8 for moving the grippers into release position. 7

The stop' gages (i adjustaoly secured a roch shaft in 11113 usual manner, the rocleshaft beingprovided with an arm 15% fixed thereon. bell-crank lever 155 is pivoted at 156 to the main frame. ()ne of the arms or the bell-crank lever 155 has a roller '15? which coacts With a cam-track 158,-rigid With the impression-cylinder, and the Gher-arm oi the lever coacts with the arnrie for rocking the stop-gages into and out of stop position. sheets may be fed oil a usual table 159 and the edges of the sheetgrest' upon usual fingers 160 coacting with the stop-gages.

the operation of the machine is fully des=i:ribe'd in connection with the description of its various elements. Aside from the ad vanta es hereinbetore recited, the invention effective prior to arrival of thebeginning 0t thesheet opposite theprinting surface of the first plate-cylinder, for, preventing printing or smudgmg of part 0t thesieet. and

thatir the impression-cylinder is" placed in.

printing reiatiom'that that relation is maintaineduntil the sheet has entirely passed theentire printing surface of thelast platecylinder, so as to insure entire printing of tie sheet, thus avoiding the spoiling of sheets, and that-further, each sheet will be properly gripped for proper printing and delivery'thereof.

The shaft 39 carries a pinion 161 fixed thereon, which meshes with a gear 162 fast on a stud-shaft 163 suitably jonrnaled in the "frame of the machine, the gear 162 having the cam 33 fixed thereon, as by bolts 164. The parts are so arranged as to cause the all cam 33 to rotate in unison with the impression-cylinder l2.

A stop loo limits the movement of the arm or the roclrci bailet? in both directions.

Having thus i'ully described my invention, what I claim as new and desire to secure by letters Patent, is:

l. in a printing press, the combination of an impression-cylinder having a normal sheet-taking position, and means for causing rotation of said impression-cylinder in printing relation or in oil-impression relation comprising means for moving said impressioncylinder into said normal sheet taking position at each revolution thereof in printing relation or in oil-impression relation, and for moving said impression-cylinder to change its axis o'lrotation between said. normal sheet-taking position and said printing relation and said oil-impression relation.

2. In a printing press, the combination of an. impression-cylinder having a normal sheet-taking position, means for causing rotation of said impression-cylinder in printing relation or in oil-impression relation comprising means lor moving said impression-cylinder into said normal sheet-taking position at each revolution thereof in printing relation or in oil-impression relation, and for moving said impression-cylinder to change its axis of rotation between said normal sheet-taking position and said printing relation and said oil-impression relation, and latching means for said first-named means comprising an automatically controlled member and a manually controlled member coacting therewith whereby to control said relations or said impressioacylinder.

3. In a printing press, the combination of an impression- .rylinder having a normal sheet-taking position, and an oil-impression relation and an on-impression relation dir" tering from said normal sheet-taking position, a support for a printing-surface, means for rotating said impression-cylinder normally in oil-impression relation with said support, and means under control of the operator during operation of the ma chine for maintaining said impression-cylinder in consecutive printing relations with said support, said means comprising means for moving said impression-cylinder into said normal sheet-taking position at each revolution thereof in printing relation or in oltimpression relation with said support.

i. In a printing press, the combination of a support for a printing surface, an impressioncylinder normally rotating in ofi impression relation to said support manually controlled means for maintaining said impression-cylinder in printing relation to said support, and means whereby to place said impression-cylinder into a sheet-takingposi tion and to cause lateral movement oithe axis of rotat1on of said impresslon cylinder vbetween said last-named position and said respective off-impression and printing relations.

5. In a printing press, the combination of an impression-cylinder normally rotating in oft-impression relation, and manually controlled means tor maintaining said impression-cylinder in printing relation comprising a latch embodying an automatically controlled member and a manually controlled member, said members having locking means between them to resist manual movement of said manually controlled member, andisaid locking means released solely by automatic movements of said automatically controlled member.

6. In a printing press, the combination of an impression-cylinder, gripping means therefor, and means for tripping said impression-cylinder for placing said impression-cylinder in printing relation or in oilimpression relation comprising means for placing said impression-cylinder in propel sheet-gripping relation dill'ering from said other relations at each normal sheet-taking moment in its revolutions.

'7. In a printing press, the combination of an impression-cylinder, gripping means thereon, sheetgaging means, and means for placing said impressioncylinder in printing relation or in oil-impression relation comprising means :t'or placing said gripping means into the same gripping relation with said sheet-gaging means at each normal sheet-taking moment inithe revolutions of said impression-cylinder and for laterally shifting the axis of rotation of said impression-cylinder between said last-named moment and said respective oil-impression and printing relations.

8. In a printingpress, the combination of an impression-cylinder, means for placing said impression-cylinder in tripped relation or in untripped relation for printing rotation or idle rotation of said impression-cylinder, and means for placing said impression-cylinder in exact sheet-taking position at each revolution thereof in tripped relation or in untripped relation.

9. In a printing press, the combination of an impression-cylinder, sheet-tahing means thereon, sheetdelivering means, means for placing said impression-cylinder in tripped relation or in untripped relation for printing rotation or idle rotation of said impression-cylinder, and means for placing said impression-cylinder in exact Sl1$l3-l31l1- ing position differing from said tripped re lation and said untripped relation at each normal sheet tal ing moment in its revolutions for properly taking each sheet for registered printing thereon and proper delivery thereof to said sheet-delivering means.v

10. In a printing press, the combination of a support for a printing surface, an im-.

pression-cylinder, sheet-taking means therefor, and means for placing said impressioncylinder in printing relation or in oil-impression relation with said supoort, said means comprising a cam having an apexportion placing said impression-cylinder in exact sheet-takingposition differing from said tripped relation and said untripped relation, at each sheet-taking moment in its rotations While said impression-cylinder is in printing relation and in Oil 'lDEPIGSSlOH relation, said cam comprising abrupt climbing and receding cam-faces at the respective sides of said apex-portion for quick movement of said impression-cylinder into printing relation or into off-impression re lation.

11. In a printing press, the combination of a support for a printing surface, an impression-cylinder having an impression-part and a sunken part about its periphery, said impression-part occupying a greater angular portion of said periphery than said sunken part, a plate-cylinder having a platesupporting surface throughout substantially its entire circumference coacting by a single revolution thereof with said impressionpart at each revolution of said impressioncylinder, rockable bushings in which said impression-cylinder is'eccentrically journaled, armson said bushings, rocker-arms having operative connections with said lastnamed arms, and a cam rotating in unison with said impression-cylinder for operating said rocker-arms and comprising lOW camportion and a high cam-portion, said 10W cam'portion extending throughout a greater number of degrees of the cam than said high cam-portion and said high cam-portion having abrupt climbing and receding cam-faces for causing quick approaches and recessions of said impression-cylinder with relation to said sup sort during rotations of said impression-cylinder.

12. in a printing press, the combination of a support for a printing surface, an impression-cylinder, sheet-taking means therefor comprising sheet-gripping grippers,

'roclrable bushings in which said impressioncylinder is eccentrically journaled, arms on said bushings, rocker-arms, having operative connections With said last-named arms, and a cam rotating in unison with sion cylinder for operating said rockerarms and comprising a low cam-portion and a high cam-portion for respectively placing said impression-cylinder in oii-impression relation and in printing relation to said support, said high cam-portion having an apex-portion for placing said impressionsaid imprescylinder during closing of said grippers in sheet-takingposition closer to said support than during printing position of saic impression-cylinder, said low cam-portion extending throughout a greater number of degrees or the cam than said high cam-portion and said high cam-portion having abrupt climbing and receding cam-faces for causing quick approacl es and recessions of said impression-cylinder With relation to said support during rotations of said impressioncylinder.

13. In a printing press, the combination of a support for aprinting surface, an impression cylinder, roclrable bushings in which said impression-cylinder is eccentrically journaled, arms extending from said bushings, rocker-arms having operative connections with said last-named arms, sheetgripping means on said impression-cylinder,

sheet-arresting means, and a cam for operating said rocker-arms, said cam comprising an apex-portion for placing said impression-cylinder in sheet-taking relation with said gripping meansin sheet gripping relablQll with, said sheet-arresting means, said apex-portion of said cam provided with abrupt climbing and receding cam faces acting to quickly move said impression-cylinder into printing relation or off-impression relation with said support, whereby the greater portion about the circumference of said impression-cylinder is employable as an impression-surface, said sheet-taking relation of said impression-cylinder differing from said printing relation and said off-impression relation thereof.

14:. in a printingpress,the combination a support for a printing surface, an impression-cylinder, rocltab e bushings which said impression cylinder is eccentric-ally journaled, arms extending from said bushings, rocker-arms having operative connections with said last-named arms, sl'ieetgripping means on said impression-cylinder, sheet-arresting means, a cam for operating said rocker-arms, said cam comprising an apex-portion for placing said impressioncylinder in sheettahing relation with its gripping means in sheet-gripping relation with said sheet-arresting means, said apexportion of said cani provided with abrupt clinil. g and receding cam-faces acting to quickly move said impression-cylinder into printing relation or ofiiimpression relation with said support, said sheet-takingrelation of said impression-cyli der differing from printing relation and said off-impres sion relation thereof, latchingmeans for said roclza-arms comprising an automatically operated latch-member and a manually controlled member coacting with the latter.

l5fln a printing press, the combination of support for a printing surface, an impressioncylinder, rockable bushings in Which said impression-cylinder is eccentrically mounted, arms extending from said liushin 's, rocker-arms having operative connections with said last-named arms, sheetgripping means on said impression-cylinder, sheet-arresting means, a cam for operating said rocker-arms, said cam comprising an apex-portion for placing said impressioncylinder in sheet-tailing relation with its gripping means in sheet-gripping relation with said sheet-arresting means, said apexportion of said cam provided with abrupt climbing and receding cam-faces acting to quickly move said impressioircylinder into printing relation or off-impression relation with said support, said sheet-taking relation of said imprcssion-cylinder differing from saidv printing relation and said oifimpression relation thereof, and a latch for said rocker arms comprising latch-retaining members one of Which has operative connection with said mechanism for being automatically controlled thereby andthe other of which is manually controlled.

in. In a printing press, the combination of an impressioncylinder, eccentric bearina's for said impression-cylinder, sheettalating means on said impression-cylinder, a support for a printing surface, and means for rocking said eccentric bearings into different radial positions for on-impression, oil' impression and sheet-taking relations of said impression-cylinder.

i7. In a printing press, the combination of an impression-cylinder, eccentric bearings therefor, and means for moving said eccentric bearings into different radial positions for onim.prcssion, off-impression and sheet-taking positions of said impressioncylinder.

18. In a printing press, the combination of an impression-cylinder normally rotating in ofi-impression relation, tripping means for locking said impressioncylinder in on.- impression relation, and automatic means for automatically moving said impressioncylinder out of both said relations into sheettaking relation.

19. In a printing press, the combination of an impression-cylinder normally rotating in oii -impresr'sion relation, tripping means for locking said impression-cylinder in onimpression relation, and automatic means for automatically moving said impressioncylinder out of both said relations into sheettalring relation, said last-named means including means for moving a movable member of said tripping means into release position.

20. In a printing press, the combination of an impression-cylinder having a normal sheet-taking position, and means for causing rotation of said. impression-cylinder in printing relation or 1n off-impression relation comprising means for placing sald impression-cylinder in said normal sheet-talring position each revolution thereof in print ing relation or in elf-impression relation, said printing relation and off-impression relation being different from said sheet-taking position. r

21. a printingpress, the cimibination of an impression-cylinder, sheet-positioning means, sheet-takin means on said impression-cylinder coercing therewith, sheet-delivering means, 'coacting trippsr-parts for placing said impression-cylinder in tripped relation or in untripped relation for printing relation or idle relation of said impres sion-cylinder, and means for shifting the axis of rotation of said impression-cylinder for releasing said coacting tripper-p'arts and placing said sheet-taking means in coactive relation With said sheet-positioning means. 22. In a printing press, the combination of an impression-cylinder, a plate-cylinder, said plate-cylinder having a plate-supporting surface substantially throughout its circumference, said. impression-cylinder being of substantially greater diameter than the diameter of said plate-cylinder and having an impression-surface throughout the major portion of its circumference, sheet-support-- ing means, sheet-taking means on said 1mpression-cylinder, said impression-cylinder having a printing position, and means for moving said impression-cylinder to position of closer approach to said sheet-supporting means than said printing position at each revolution of said impression-cylinder, and means causing closing movement of said sheet-taking means while said impressioncylinder is in position of closest approach.

23. In a single revolution printing press, the combination of a plate-cylinder having a plate-supporting surface substantially throughout its circumference, an impressioncylinder of substantially greater diameter than the. diameter of said plate-cylinder and having an impressionsurface throughout the major portion of its circumference, for coacting with said plate-supporting surface throughout substantially the circumference of said plate-cylinder, said impression-cylinder normally rotating in off-impression relation to said plate-cylinder, and manually controlled means for maintainins said impression-cylinder in printing relation to said plate-cylinder.

2st. In a printing press, the combination of a support for a printing surface, an impression-cylinder, and means for rotating said impression-cylinder and positioning the paths of rotation of said cylinder in & impression relation and in on-impression re lation to said support and for sheet-taking relation of said impression-cylinder, said rotary path of said sheet-taking relation being different from the rotary paths of said offimpression and on-impression relations.

25. In a, printing press, the combination in off-impression position, of ineans'beyond the control of the operator for bodily and actively moving the cylinder into sheet-taking position at each revolution thereof in dependent of my manipulation by the 0peretor, a holding; means acting under the control of the operator when the cylinder is 10 in sheet-taking position said holding means acting to lock the cylinder so as to rotate in on-i npression relation.

In testimony whereof, I have hereunto signed 1113* name in the presence of two subscribing Witnesses.

FR nner )K n. nnnonn. Witnesses THERESA M. SILBER, DAWSON E. BRADLEY. 

